Fluid-pressure motor



Nav. 3,1925. 1,559,751

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S.' HINDS :FLUID rxsssuna uo'ron una may 1v. 1920 a 5115919511. 2

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29j @gi QM@ M 7' Nov. 3 1925. 1,559,751

S. HINDS FLUID Pnnssuxa uo'ron Filed May 1'7. 1920 8 Sheets-Sh'ii 5 i ul Nov',` 3,1925.

S. HINDS FLUID Pnassuna Moron ruea may 1v. 1920 8 Sheets-Sheet 6V v Nay? 3, 1925.

1,559,751 s. Hl'Nns `FLUID PRESSURE MOTOR mea may 1v. 1920 a sheetsnm v Egfr? i Nov. 3, 1925.

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unirse sfrnffriis PATENT oFFicE.

sirnnwoon H'rmis, ori` nonna/'MINE INnIANn, A'ssIGNoR cro s.' n'. Bowsnne" COM- PA'N'Y, INC., OFFOR'B WAYNE-,l INDIANA, A' CoRPoRATfroN 0F INDIANA;

FL'UiinerREssURE- Moron.

Appiitiomiiee my 17, 1920. seriai No. 381,868.

i o all whom z'zmay concern: p

'13e it known that IySiiiiirwooD I-IiNns, a

citizen of the United States, residing ata For-t lfayne, in the county of Allen and shall be of ini-proved construction-andfoper-v ation. y

The invention is exemplified in tliecoinb-ination and arrangement ofthe parts shown in the accompanying drawings andv described in theI following; specification, and itis more particularly pointed o-ut inthe'- appended claims.

In the drawings- Figi. 1 is a vertical section of` a" pun-ip showing one embodiment of the presentinvention;

Fig. 2 is a 2 2 0i Fig. i,

Fig. 3 is a fragmentary section: S-S'vof Fig; 1; f`

Figf;l is a fragmentary section on 4.-4"o-f-Fig; 1;k

Fig. 5 is al fragi-nentary section 5-15 off-Figfl';

G is a horizontal-section substantially on line 6-6 of F lwith paits'om-itted;

Fig. 7 is a' vertical section on line 7 7 of Fig.4 6 g Fig.' S is a-lioi'izo-nital section on line 8-8- of Fig.` 7;

Fig.. 9 is a top plan view of tlie'inotor shown in Fig.. 1*:

fragmentary section on line on line line on line` Fig. l() is a vertical section on line 10-10 of 1v;

11y is a horizontal section on lfi-ii-ev 11-11 of Fig. 11;

Fig?. 12 isa fragmentaryelevatiori'showingI ai portion ofthe mechanism illustrated in Fig. 1 but on a larger sc'aleg l Fig. 13 is a yvertical section online 13-13 of Fig. 12f u Fig. 14 is a vertical' section on li'ne- 141-14 of'Fig. 13;

Figs.' 15, 16 and 17 are views simi-lar to.-

Fig; 14 but' on' a somewhatsinaller'scale and showing thel parts in different positions Fig.v 18- is a fragmentary vertical sectionon line 18-18 of Fig-.13;

Fig.v 19 is a fragmentary view similai` tol la portion'of Fig. 12 but showinga iii'oditied1 construction; and

Figr 20 is a verticalv section substantiallyl on line 20-20 of Fig. 19.

It is common practice in the dispensing of liquids, such as gasoline, to provide dispensing pumps having reciprocating pump .rods which are usually provided with a rack driven by a pinion and operated by a hand crank or similar mechanism. In places where such pumps are install-ed. coinp-ressed air is usually available as a motive force, andthe-present invention is adapted to make use ofsucl'imotive force for operatingVA the dispensing pumps, It is under-4 stood of course, that thefinv'ention is. capable of other applications;l and the one rcf'erred tois cited .by Way'of example.

In the embodiment of the invention illus T trated a cylinder'2i is' prov'idedfhaving a double-acting piston 22 connected to a-piston rod 2Sand arrangedto` reciprocate in the cylinder.. A suitable stuffing ybo`x'24 is yprovided aft'the uppere-nd'l of the cylinder and a bracket 25 is connected with the upper end ofthe ro'd`23l and Acarries a bell. 26 whichserves asA aV weather slii'eldfor the'stufling box 24.' The bracket 25Lis secured to aracklv 2.7 by'nie'ansofY atl'ireadedscrew 28,7andfa b'ell.29=`is f'orined'on the bracket'in-position to shield the upperv endA ofthe rack As' sli-own more clearly in Fig.. 10, theiiackQf'-V meshes with a pinion on a shaft 31..` IV-herethemotor yis" used' for operating a dispensing puinp the sl'iaft'lv is connected withV the operating-shaft of'` the pump'7 or, may be made continuous with the pumpoperating shaft.` It will be: apparent that the reciprocation' ofthe piston 22 and the rod-23 will cause the ra'ck`l27 to reciprocate inV unison therewith and-thus impart rotation to the shaft'l ,anddrive the operating.r mechanism of'fthe dispensing puin-p or'other device connected'with the drive shaft.

The lower end of'tlie cylinder 2l-is supported ina castii'ig S25-shown bestin Figs. 6, 7 and-*58. A* depression. 33 is formed in the castingbeneatli the lower end of the cylinder" 21 and is'connected by agpassage 34E with an openingfin .the finished face {i6-'of the casting, A-siinilar opening;-v 37. is connected with a passage 38'. which communicates'. through' openings) with tli'e interior of a tube at() which forms one of the con-V necting rods between the lower casting 32 and an upper casting 41 which lits over the upper end of the cylinder 21, as shown in Fig. 1. The upper end of the tube 40 communicates with Aa port 42 opening into the upper end of the cylinder 21. 1n this way the opening 35 is connect-ed tothe lower end of the cylinder below the piston 22 while the opening 37 communicates with the upper end of the cylinder above the piston.

As shown in Figs. 13 and 14 a casting 43 is provided with a lower finished surface 44 which fits upon the upper face 36 of the casting32 and is provide-d with passages 45 and 46 which register with the openings 35 and 37, respectively, in the face 36 cf the casting 32. Suitable bolts 47 are provided for holding the two castings in iirin contact with one another, and a gasket may be placed between the two finished faces 36 and 44 if found desirable.

As shown in Figs. 13 and 14 the casting 43 is provided with a vertical flat face 48 which forms the seatfor circular rotary valves 49, 50 and A51. These valves are enclosed in a chamber 52 formed by a casting 53 which fits against the face 48 of the casting 43 and is held in place by suitable cap screws 54. Air under pressure is admitted to the chamber 52 through a hose connection or other conduit 55, and a second conduit 56 may be connected with the chamber 52 and provided with a valve or other closure which may be opened to lpermit the discharge of air from the chamber for cleaning' or other purposes. A shaft 57 is journaled in the casting 53 and is provided with a disc 58 flattened at one side, as shown in Fig. 14, and fitting into a correspondingly shaped recess in the valve 49 to properly seat the valve on the surface 48 and cause the valve to rotate with the shaft. A spring 59 resiliently presses the valve against the Y surface 48 and the air pressure on the outer face of the valve also assists in holding the valve against the surface. A suitable stuffing box 60 is provided for the shaft 57, and the outer end of theshaft carries a spur gear 61 by which the shaft and valve are operated in a manner to be described. The valve 50 is properly centered and held in place against the face 48 of the casting 43 by a bushing 62 fitting in a recess 63 in the casting 53, and a spring 64v resiliently presses the valve against the surface 48.

The valves 49 and 50 are provided with intermeshing gear teeth to cause them to rotate in unison with one another. rlChe valve 51 is provided with a sha-ft 65 similar to shaft 57 and a stufiing box 66. The outer end of the shaft carries a spur gear 67 operated in a manner to be described. The movement of the valve 51 about its axis of rotation isrindependentof the valves 49 and 50. Y

As shown in Fig. 14, the passage 45 in` the casting 43 leads to an opening 68 in the rear of the valve 50 which opens against the face of the valve 50 through the surface 48 of the castingy 43'. The passage 46 is provided with a similar opening 69 against the rear face of the valve 49. The valve 49 is provided with two arcuate grooves 70 and 71 which lie opposite one another and each is of approximately a quarter of a circumference. The rear face of the valve 50 is provided with anarcuate groove 72 extending for approximately half a circumference. The rear face of the valve 51 is provided with an arcuate groovey 73 of approximately a quarter of a circumference. The valve 51 is provided with two perforations 74 and 75 extending through the valve and permitting pressure fluid from the chamber 52 to reach the face 48 of the casting 43. The casting 43 is provided with a vertically extending passage 76 having an opening 77 at the lower end communicating with the surface 48 ofthe casting 43 and a similar opening 78 at the upper end,the opening 78 being offset laterally from the center of the casting, as shown in Fig. 14. The casting 43 is provided with exhaust ports 79, 80 and 81 which extend from the surface 48 through the casting to the atmosphere. The valves and ports described control the admission and discharge of the compressed air from the chamber 52 to the cylinder 21 for operating the piston 22.

The gear wheel 61 which controls the valves 49 and 50 meshes with a rack 82, as shown in Figs. 1 and 12. `The raclr 82 reciprocates in a guide 83 and at its upper end is connected to a weight 84 having a stop 85 to limit its downward movement. A rod 86 is connected to the upper end of the weight 84 and passes upwardly to theupper end of the motor casing and is secured-to a cable or chain 88'passing over suitable pulleys and guides to a position convenient to the operator. This `chain will usually be carried to the point of discharge of the hose for the dispensing pump so that the operator may control the chain at the same time that he is directing the discharge of the liquid from the hose. When the operator by pulling on the cable 88 lifts the rack 82 the full extent of its movement the gear wheel 61 is vgiven a half revolution in a clockwise direction, as viewed in Figs. 1 and 12. This will admit air under pressure to the cylinder 21 below the piston 22 in a manner to be described, and will cause the piston and rack 27 to be raised. The lower end ofthe rack 27 is provided with a contact plate 89 arranged to cooperate with 'a series of stops 90, 91', 92, 93, 94 and'95 carried by a control rod 96. The control rod 96 isjournaled in the casing of the motor to oscillate about its axis and also ing 9.7 inlthe-p'late-41.

various `stops carried by theV rod 96, areV its lowermost position andi maybe moved' upwardly until the stopengages-thebear- The shfapesl' ofthe shownin- Figs.- 2 to` 5'-, inclusive', andaisingle alining bar 98- eXtends through all" of the stops to hold them from rotation" on the control 'rod 96.- Ohe or morey of the'stops may be keyed to the rod 96, as shown in Fig. 5.` The lower end of the rod'- 96 is provided with a spring-99w-hicli normally tends to rotate the rodinar counterclockwise direction, as viewed from the upperl endi The rod is turned about its-axis against the tension oi'f thespring 99 by a rack-100v mesh-- ing with apinion-101 connectedfwithatlie gear 61 to rotate invunison therewith. TheA rack isprovided with a'laterally project-ing flange '102 arranged to bear against an arcuate extension 103011` the= stop 90.` When thefrack bar 82 is raised torotate the gear 61 the rack 100 will be moved to the left, as viewed in Fig.v 12, and will rotate the control rod 96 through approximately 90 degrees in a clockwise direction, asviewed in'Figs. 2 to 5.- A'spreviously stated, the rotation of the gear 61 causes thepiston 22 and the rack bar 27 to move upwardly andthe movement ofA the Control rodV 96 by the rack 100 `sets the stops 91, 92, 93' and 94 in a position: to permitthe up-v ward movement of the rack bar 27Withou-t engagingl the contact plate 89. The stops 92, 93 and 94" are all 'similarly shaped,.as illustrated in Fig. 3, andare each'provided with aprojection 104 which lies-in the -path of the contactI plate 89 when Itherod 96 is rotated 45 degrees from its norm'al'position illustrated in Fig. 3. When, however, the rod is rotated approximately 90 degreesby a complete upward movement of vthe rackI bar 82, the projections104 will'fmove beyond the path of the contact plate 89 thus providing an unobstructed path for the plate. The contact member` 91,r as shown in Fig. 4, is-of al Shape similar ltol thatl of the member 92 shown in Fig. 3, except that the portion of the stop 91 opposite the projection 104 is provided with an vextended iange 105 which Aserves an additional purpose to be described. The operation of thesto-p 91 with relation tothe rack 27fis exactly the same as that of thefstops 92, 93 andV 94. The stop 95,- however, is provided with a continuous flange-106 which lies in the path of movementof'tlie Vcontact member 89 forall Apositionslof the-control rod 96. A

When the rack bar` 27 reacheswits uppermost position the contactsmemberf 89 will strike vthe stopy295 and* raise thefoontrol "rod 96. This will reverse the action of the: pis# ton 22 in a manner to be described and "will also fornr a' positive lim-itf for the movements ofthelrackiba1f27i l By thismeansthemos. tor may be made toimove arunlfformaamount atf each strokeso that the` quantities:v o: liqv -uid pumped'E by the different? operations lof.

the motor will beuniform.' Y

Thereversal ofthe piston 22by the move` ment 'ofi the control lrod- 96 when thevrafc'kfbarj 2.7 reaches its uppermost position is producedby, thelvalve 511. rllhe--mechan'ism` for: oper.` ating this valve-is illustratedA in Figs; 12,213`

Vand 18.l A's: shown invliigs.'l 4' andi-18, theL fla-nge 1051011 vthe stop2f9l ext-ends between a pair ofjaws '107 on a rocker1108. Thelroekeri 1082 is provided with aV gear segmentl 109" meshingf with* a gear 'segment 110 on'an oscill'atory' member 1111- pivotally mounted ona studfbolt 112 Asupported onrthecastingf; as shown vin-f=Fig:13. K The oscillatorymem'-y ber 111is provided witha circular groove-for recess 118 forming` af housing for a. coil spring 114.' The ends of thelsprin'g '1141bear against movable blocks 115-and 116 arranged' to slide inthe'frecess 113. Apairfoflugsvllprojectfrom the walls ofthe recessrlland form-stops for they blocks 115fand116; -A` passage 118 is provided-'between the-adjacent faces of the lugs f117 "to receive/thev end ofa pin 119. The pin 119 projects'fro-mtheface of la disc 120 alsovpivotedonfthe studfshaft 112 and free to\oscillate-thereon.l The disc 120 carries a geary segment l121 "whichmesh'es withth'e gear 67011 the shaftlG. The'disc 120 is provided with notches 122 m1611123 for receiving the holding ends offa pair? of Ivdogs 124and 125, respectively, A coilfspring2126 engages` arms`127` on the-dogs1124and 125 andnormally 'pressesV the dogsagainst 'the disc'120. The dogs 124an`d:125`are provid-ed with tailpiecesl 128anfd 129, respectively,"in positionfto be engaged by tappetsf130 "and 131 carried bya projection' 132 on -tl 1eoscillatory member 111.v A plate 133f engages the outerend ofithe stud 'bolt 112 and'is se'- cured thereon by,v ay nut1341 The plate 133' also forms a-support for the outerends of the pivotal mountings for the dogs 124. and Vand therocker 108; Vhenitheparts are in Athe-position shownv in Figs'. 12an`d :18 before the rocker 108 is actuatedby they upward movement otthe'control rod 96Vtl1e dog 125` will be in engagement with the notch 123'1to. hold the disc-120 from move# ment in' a counterclockwise* direction,V as viewed in these igures.y Then-therocker 108 is'actuated. bythe-movement of the control rod 96at the upper end of the/.strokeiof thepiston 22 theoscill'atorv member 111 will' be moved in acounterclockwise direction, as viewednfFigs; 12'fand 18."y Thisjwill cause thelugs 117' to carry with-them thezblock "115 and-'thus compress .ther-spring 114e. The *block 116 vis lheld from.. .movement .by'l ther-'pin y119 which. is :connected to fth'e disc 120,y the Idiso in turn l.beingg held by y the f. doge-'125;l p Vifhen the oscillatory member 111 has moved sufficiently to bring the tappet 131 into contact with the tailpiece 129, the dog 125 will be disengaged from the notch 123 and the disc 120 will be released. This will permit the spring 114 to expand and cause the block 116 to move the pin 119 and thus impart a partial rotation to the disc 120. The movement of the disc 120 will be transmitted by the segment 121 to the gear 67 imparting a quarter turn to the shaft and the valve 51. In this way the final portion of the upward movement of the piston 22 compresses the spring 114 and stores up energy therein, which energy is released at the very end of the upward movement of the piston and caused to rotate the valve 51, which movement of the valve 51, as will be explained, reverses the direction of movement of the piston22 in the cylinder 21. When the piston reaches the lower end of its stroke the contact plate 89 will engage the stop 90 on the lower end of the control rod 96 and will move the rod downwardly to return the rocker 108 to the position shown in Fig. 12. This return movement will again compress the spring 114 until the tappet 130 is caused to engage the tailpiece 128 of the dog 124. When this occurs the dog 124 will be released from` the notch 122 and the disc 120 will be returned to the position shown 1n Fig. 12. This will return the valve 51 to its original position and cause the piston 22 to again move upwardly in the cylinder 21'. It is thus apparent that the piston 22 will continue to reciprocate in the cylinder 21 and will be automatically reversed by the control rod 96 at each end of a stroke. As long then as the operation of the automatic reversing mechanism is not interfered with the motor will continue to operate the pump definite amounts at each stroke.

Starting and stopping of the motor is controlled by valves 49 and 50 in a manner which will best be understood from Figs. 14 to 17, inclusive. As previously explained, the passage 45 in the casting 43 communicates with the cylinder 21 below the piston 22, while the passage 46 communicates with the cylinder above the piston. When the control valves are in their normal inoperative position and the rack 82 and weight 84 are in their lowermost position, as shown in Fig. 1, the passages 45 and 46 will both be open to atmospheric pressure so that no pressure is exerted on either side of the piston 22. Under these conditions the valves will be in the position shown in Fig. 14 and'the upper end of the passage 45 will communicate thro-ugh the arcuate groove 72 in the valve 50Y with the exhaust port 80. At the same time the passage 46 will communicate through the arcuate groove 71 in the valve 49 with the opening 77, and the passage 76 to the arcuate groove 73 in the valve 51, and thence to the exhaust port 7 9. When the operator pulls upon the cable 88 to the full extent of its movement the gear wheel 61 will be given a half revolution, thus moving the valve 49 18() degrees in a clockwise direction, and the valve 50 180Ldegrees in a counterclockwise direction, as viewed in Fig. 14. This movement will cause the grooves and 71 in the valve 49 to interchange their positions and will shift the groove 72 in the valve 50 180 degrees. The resulting positions of the valves is illustrated in Fig. 15. This will permit air under pressure to enter through port 74vin valve 51 into a passage 135 in the casting 43 which communicates through an opening 136 to the rear of the valve 50. From this point the pressure will be transmitted through the groove 72 in the valve 50 to the passage 45, and thence to the lower end of the cylinder 21. At the same time the upper end of the cylinder is open to the atmosphere through 4the passages 46, 70, 76 and 73 and exhaust port 79. The pressure fluid entering vthe lower end of the cylinder will cause the piston 22 to be moved upwardly until the contact plate 89 strikes the stop 95 and causes a quarter revolution of the valve 51 in the manner previously described. When this occurs the opening 75 of the valve 51 and the groove 73 will be shifted 90 degrees in a clockwise direction, bringing the parts into the position shown in Fig. 16. Under these conditions the lower end of the cylinder 21 will now be connected through the passage 45, the groove 72, the passage 135, and the groove 73 with the exhaust port 79. At the same time the upper end of the cylinder will be connected to the passage 46, the groove 70, the passage 76 and the opening 75 with the compressed air in the chamber 52. This, of course, will permit the compressed air to enter above the piston 22 and positively return the piston to its lower position, whereupon the valve 51 will be again shifted, as previously explained, and this operation will continue as long as the operator continues to hold the cable 88 pulled -outwardly to its extreme position. To discontinue the operation of the motor it is onlynecessary for the operator to release the cable 88. When this is done the weight 84 will return the rack 82 to its lowermost position and restore the valves to the position shown in Fig. 14 in which both ends of the cylinder 21 are connected with atmospheric-pressure. It is apparent, therefore, that as soon as the cable 88 is released the operatio-n ofthe motor will cease. It should be noted that in order to cause the motor to continue to operate a positive act on the part of the operator is required. In case of accident or in case the attention of the operator is Vdistracted so that he ceases to attend to the work, the moment that the cable 88 is re- I claim 1 .A motor comprising a piston, valve mechanism for controlling the operation of said piston, stops for arresting said piston after it has moved various measured amounts, means actuated by said stops for controlling said valve mechanism, and means for setting said valve mechanism to operate differently under the `control of said stops when different ones of said stops are in operative position to limit the movement of said piston.

2. A motor comprising a reciprocating piston, a stop for limiting the movement of said piston, a valve for controlling the operation of said piston, and a single device for operating said valve and for moving said stop into and out of operative position.

3. A motor comprising a piston, a support having a lplurality of stops thereon for limiting the move-ment of said piston, a valve for controlling the operation of sai-d piston, and a single device for operating said valve and for actuating said stop support to shift the position of the sto-ps thereon.

4C. A motor comprising a piston, valve mechanism for controlling the operation of said piston, a support having stops thereon for limiting the movement of said piston. a single device for operating said valve and for shifting said support to move certain of the stops thereon into and out of operative position, means operated by said piston for engaging said stops, and means controlled by said stops for operating said valve mechanism to vary the movement of said piston.

5. A motor comprising a cylinder having a piston therein, a valve for controlling the admission of fluid under pressure to said cylinder to actuate said piston, a second valve for reversing the direction of movement of said piston in said cylinder, stops for limiting the'movement of said piston to predetermined measured amounts, a support for said stops, and meanscontrolled by one .of said stops for actuating said second valve.

6. A motor comprising a cylinder, a piston in said cylinder, a valve for controlling the admission of iuidnnder pressure to said cylinder to move said piston, a second valve for controlling said Vf lnidto reverse the direction of motion of said piston insaid cylinder, a support having stops thereon for limiting the movement of said piston to predetermined measured amounts, a-single devicev for operating said first-mentioned valve and for shifting said support to bring certain of said stops into and out of operative position, and mechanism controlled by certain of said stops when said support is in one position for operating saidvs'econd-mentioned valve to' automatically*reverse the direction of movement of said'piston at the ends of the stroke thereof, said mechanism being operable by a different one of said stops-to cut off the supply of Huid from said cylinder When said support is moved to bring said last-mentioned stop into operative position.

v7. The combination With a cylinder, of a piston movable therein, valve mechanism for controlling the movement of said piston in said cylinder, stops for controlling said valve mechanism, and a device for shifting said valve mechanism and simultaneously settingk said stops.

8. The combination With a fluid pressure actuated device,` of a valve for controlling the admission of fluid to said device, means for periodicallyy actuating said valve to reverse the direction of motion of said device, valve mechanism `for controlling the admission of fluid under pressure to said `firstmentioned valve, and means for setting said valve mechanism in one position to permit periodic reciprocation of said device under the control of said first-mentioned valve and for setting said valve mechanism in another position to cause a discontinuation of the movement of said device when said firstmentioned valve is actuated.

9. The combination With a cylinder and a piston arranged to move therein, of valve mechanism for controlling the movement oit said piston in said cylinder, and means for setting said valve mechanism in one position to cause periodic reciprocation of said piston and for setting said valve mechanism in a diterent position to arrest the movement of said piston at predetermined points in the path of movement thereof, sai-d means being operable to cause renewal of the movement of said piston after such arrest. 10. The combination with a cylinder and a piston movable therein, of mechanism 'or controlling the movement of said piston in said cylinder, and means for setting said controlling mechanism movable into one position to cause periodic-reciprocation of said piston and into a different position to arrest the movement of said piston at predetermined po-ints in theV path of movement thereof, said means being yoperable after said arrest to restore the movement of said piston. 1l. The combination with a cylinder and a piston movable therein, of valve mechanism fory controlling said piston, means controlled by the operator for setting said valve mechanism in position to cause movement of said piston, and means for automatically settingsaid valve mechanism in position to cause the'movement 'of said piston to be discontinued Whenever said operator controlled valve set-ting mechanism is released.k

12.V The combination' with a cylinder and a pistonliffarranged to move therein, of a control'lrod having a plurality of stops thcreonfmeans .actuated by said piston f9.1"

engaging said stops, valve mechanism for controlling the admission of :fluid under pressure to said cylinder, means for shifting said valve mechanism, and means for moving said control rod to change the position of said stops on said valve mechanism when said valve mechanism is shifted to cause different ones of said stops to cooperate with said piston for different positions of said valve mechanism. A

13. The combination with a cylinder and a piston arranged to move therein, of valve mechanism for controlling the admission of fluid under pressure to said piston, a control rod having stops thereon, means actuated by said piston for engaging said stops to shift said control rod, means actuated by said control rod for shifting said valve mechanism When a stop on said rod is engaged by said piston actuated means, manually operated means for shifting said valve mechanism, and means for shifting said control rod to bring different stops into position to cooperate With said piston actuated means when said valve mechanism is shifted by said manually controlled means.A

14. The combination with a cylinder and a piston arranged to reciprocate therein, of a valve for controlling the admission of fluid under pressure to said cylinder, a control rod having stops thereon, means Vactuated by said piston for engaging said stops, means actuated by said control rod when a stop is engaged by said piston actuated means to shift the position of said valve and cause a reversal of the direction of movement of said piston, valve mechanism for controlling the admission of fluid to said inst-mentioned valve, stops arranged on said control rod intermediate said first-mentioned stops, and manually controlled means for shifting said control rod to bring one of said intermediately arranged stops into position to cooperate with said piston actuated means and to shift said valve mechanism to cause said first-mentioned valve to shut ol"` the supply of fluid pressure from said cylinder when one of said intermediate stops is engaged by said piston actuated means.

15. The combination with a cylinder and a piston arranged to reciprocate therein, of a plurality of disc valves for controlling the admission of fluid under pressure to said cylinder, means actuated by said piston for shifting one of said valves to reverse the direction of movement of said piston in said cylinder When the other of said valves are in one position, manually operated means for shifting the said other valves to control the passages between said first-mentioned valve and said cylinder, and a device actuated by said manually operated means to cause said first-mentioned valve to be shifted by said piston at a point intermediate the ends of the stroke thereof when said other valves are set in one position by said manually operated means.

16. The combination With a cylinder and a piston arranged to move therein, of valve mechanism for controlling the movement of said piston in said cylinder, said valve mechanism comprising a pair of disc valves geared together to move in unison With one another, a third disc valve movable independently of said pair of valves, a member' having a surface against which said valves are seated, said third valve having openings therein for admitting fluid under pressure to passages in said member While said pair of valves are provided with means for controlling said passages, .means actuated by said piston for shifting said third valve, and manually operated means for shifting said pair of valves.

In testimony whereof I have signed my name to this specification on `this 26th day of April, A. D. 1920.

SHERVVOOD HINDS. 

